System of control.



H. D. JAMES. SYSTEM OF CONTROL.

APPLICATION FILED SEPT. 19, 1910.

2 SHEETSSHEET 1.

Patented Nov. 18, 1913.

INV TOR WITNESSES:

ATTORNEY QMOSXCY LW' H. D. JAMES.

SYSTEM OF CONTROL.

APPLICATION FILED SEPT. 19, 1910.

Patented Nov. 18, 1913.

2 SHEETSSHEET 2.

22 g h ENTOR WITNESSES:

ATTORNEY UNITED STATES PATENT ormon HENRY n. JAMES, or rrrmsnonen,

PENNSYLVANIA, ASSIGNOR ro wnsrmenousn ELECTRIC AND MANUFACTURING CbMPANY, A CORPORATION OF PENNSYLVANIA;

SYSTEM OF CONTROL,

Specification 0! Letters Patent.

Patented Nov. 18, 1913 Application filed September 19, 1910. Serial No. 582,657.

ample and effective means for automatically removing resistance from the secondary c1rsuit of an alternating current induction motor, or .for otherwise governing the operat m of a motor of this type, in accordance Wlththe amount of current supplied thereto.

Figure, 1 of the accompanying drawing .liustrates diagrammatically 'a system of 'g-control which embodies my invention, and

nect ed in series with resistances 5, 6 an Fig. 2 is a similar illustration of a modification ofthe system shown in Fig. 1.

The system comprises an induction motor I, the primary member of which is con nccted to a suitable sup ly circuit 2, 3 and 4,

and the secondary win mg of which is odor to suitable points of subdivision of which the terminals of a plurality of separately actuated switches 8, 9' and 10 are respectively connected. The switches 8, 9 and 10 are actuated, or are governed in operation, by means of ma et windings or coils 11, 12 and 18, respectively, one terminal of each of which is connected to circuit conductor 4 and the other terminals of which are respectively connected to contact members 15, 16 and 17 of interlocking switches 18, 19 and 20 that are operated, respectively, by the switches 8, 9 and 10. Contact terminal 22,

of the interlocking switch 18, is connected to one terminal of a voltage-generating de vice 23, the other terminal ofwhich is connected to circuit conductor 3, the voltagegenerating device being thus normally included in series circuit with the coil 11 of the switch 8. As here shown, the roltagegenerating device is an induction regulator having relatively movable members, the member-24 of which is adapted to be operatedby an electro-magnet having a winding 25 connected in series with circuit conductor 4, or otherwise supplied with current which is proportional, in amount, to that which traverses the said conductor. The member 24 normally occupies the position shown, so that under this condition the regulator has no efiect upon the voltage which is applied to the coil 11. However, when the current which traverses the conductor 4 exceeds a predetermined amount, the member 24 is rotated in a clockwise thereby caused to produce a voltage in opposition to that which is applied to the coil 11 from the circuit conductors 3 and 4.

The interlocking switches 18, 19 and 20 'are so constructed that, as the corresponding switches are closed, the coils 11, 12 and 13 thereof are transferred from the actuating circuit, which includesthe voltage regulator, to another or retaining circuit, including conductor 27 that is connected to circuit conductor 3. When the switch 11 is closed, the interlocking switch 18 also serves to connect with the voltage regulator, and when'the switch 9 is clo-sed,'interlocking switch 19 serves to connect the winding 13 of the switch 10 in circuit with the voltage regulater.

I When the primary winding of the motor 1 is connected to the circuit 2, 3 and 4., there is a rush of current which passes through the coil 25 and causes movement of the member 24 of the voltage regulator in a clockwise direction. Although a circuit is then com plete through the coil 11, by way of parts 4, 11, 15, 18, 23 and 3, the said coil will not be suflicientl energized to effect operation of the switch 8, because the voltage regulator produces a voltage inopposition to that which is applied to the coil 11 from the circuit 34. However, as the speed of the motor 1 increases, the current supplied to it through the conductor 4 diminishes, and, when. diminished to less than a predetermined amount, the movable member 24 of the. regulator returns to its normal position, wherein it opposes no voltage to the voltage supplied from the circuit 3-4 to the coil 11. The coil 11 then closes the switch 8 and also operates the interlocking switch 18,

Switch 8, when closed, short-circuits parts of the resistances 5, 6 and 7 and thus causes an increase of current in the motor windings. The increase of current in the conductor 4 and in the coil 25 again causes rotation of the member 24 of the voltage reg- -direction, and the induction regulator is v the winding 12 of the switch 9 in circuit ally 0 ing the switch 8.

regulator does not oppose the voltage ofthe circuit 3-4. The winding 12 of the switch 9 then becomes sufliciently energized to close 'the switch 9 and thus establish circuits sim lar to those which were established by clos The operation of the system continues as above set forth until all of the switches have been closed and the resistances 5, 6 and 7 have been completely short-circuited. Any desired number of switches may be employed, and the structural details and arrangement of the parts and their connections may be considerably modlfied from what have been shown, without departing from the spirit of the invention.

The invention may also be employed in other relations than that illustrated by Fig. 1, as, for instance, for governing the voltage applied to a motor, as shown m'Fig. 2,-in which multiple-pole switches 30 and 31 are employed for connecting the primary member of an induction motor either to suitable intermediate points of transformers 32 and 33, that are connected to supply circuit 34- 35-36, or directly to said circuit. The said switches are operated, or are governed in their operation, by means of magnet windings 37 and 38, respectively, the circuits of which are controlled primarily by a'manuerated master switch 39 and secondari y by interlocking switches 40 and 41 that are operated, respectively, by the main switches 30 and 31. In series circuit with one of the primary conductors to the motor is a magnet coil 42 for actuating the mov able member43 of an induction regulator, the winding 44 upon which is included in circuit I with switches 30 and 40 are closed. be primary winding 45 of the regulator is connected between main circuit conductors 35 and 36.

en master switch 39 is closed, a circuit is established through magnet winding 37, by Way of parts bearing reference numerals 35, 39, 37, 41 and 36, and switch 30,closes and connects two of the terminals of the primary winding of the motor to intermediate points of the transformers 32 and 33. Y The lnterlocking switch'40 also'closes and establishes the circuit of magnet winding 38, by way of parts bearing reference numerals 35, 39, 38, 41, 40, 44 and 36. However, if the current traversing the coil 42 exceeds a pretrollin magnet ,windin 38 when main the circuit of said coils, and means determined amount, the movable member 43 of the induction regulator will occupy a position such that the regulator yoltage wlll oppose that applied to the windlng 38 from the circuit 35-36, and the said winding w1ll not become sufficiently energized to close the switch 31 until the current traversing the coil 42 has fallen to less than the predetermined amount, whereupon the movable member 43 of the regulator assumes its normal position and no'longer opposes the voltage of the circuit 35-36. I 31 then closes and connects the primer winding of the motor directly to the circuit 3435-36. When the switch 31 closes, the interlockin switch 41 interrupts the circuit of the win ing 37,- so that the switch 30 will open, and connects the winding 38 directly The switch to the conductor 36 without the intervention of the winding 44 of tor.

I claim as my invention:

l. A system of control cuit, a plurality of separately actuated switches, coils governing the operation thereof, interlockin switches actuated by the aforesaid switc es and severally trollin the circuits succee 'n'g switches, a volta e-generating device in series with the said coi s, and means actuated in response to variations in the current traversing said circuit forgovernthe induction reguladevlce. I

2. A system of control comprising a circuit, a plurality of separately actuated switches, coils governing the operation thereof, interlockin switches actuated by the aforesaid switc es and severally conthe circuits of the coils of the next succee ing switches, a voltage-generatin device in series with the said coils, an means for causing the voltage-generating device to diminish the said coils when the current traversin the said circuit exceeds a predetermine r amount.

3. A system of'control comprising a main circuit, a plurality of separately actuated switches, coils governin the o eration thereof, means for applying a v0 tage to the circuit of said coils, a voltageenerating dev ce in series with the coils, an means or causing the voltage-generatin device to apply a counter voltage to the circuitof said coils when the current traversing the circuit exceeds a predetermined amount.

4. A circuit,.'a plurality of separately actuated switches, coils governing the o eration thereof, means for applying a voltage to for applying an opposing voltage'to the circuit .of said coils when .the current traversing comprising a circonof the coils of the-next ing the operation of the voltage-generating the voltage applied to i system of control comprising a main the main circuitexceeds a predetermined amount.

5. A system of control comprising a main circuit, a plurality of separately actuated switches, coils governing the operation thereof, an actuating and a retaining circuit therefor, a voltage-generating device in series with the actuating circuit, and

means for causing the voltage generator to oppose the voltage of the actuating circuit when the current traversing the main circuit exceeds a predetermined amount.

6. A system of control comprising a circuit, a plurality of separately actuated switches,- coils governing the operation thereof, a voltage-generating device in series with the said coils, and means actuated in response to variations in the current traversing said circuit for governing the operation of the voltage-generating device.

7. A system of control comprisinga cir-' cuit, a .plurality of separately actuated switches, coils governing the operation thereof, a voltage-generatlng device in series with the said coils, andmeans for causing the voltage-generating device to diminish the voltage applied to the said coils when the current traversing the said circuit exceeds a predetermined amount.

8. A system of control comprising a main circuit, a plurality of separately actuated switches, coils overning the operation thereof, an actuating and a retaining circuit therefor, a voltage-generating device associated with the actuating circuit, and means for causing the voltage generator to oppose the voltage of the actuating circuit when the current traversing the main circuit exceeds a predetermined amount.

9. A system of control comprising a circuit, a plurality of separately actuated switches, coils governing the operation thereof, a voltage-generating device associated with said coils, and means actuated in response to variations in the current traversing said circuit for governing the operation of the voltage-generating device.

In testimony whereof, I have hereunto subscribed my name this 12th day of Sept,

HENRY D. JAMES. Witnesses:

FRED C. HANKER, B. B. HINES,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

